How to use Config File In Linux

Step 1: Open a Terminal

In the very first step, we need to have an active terminal, through which the entire profile of profiling will be done. In Ubuntu, we can open the terminal by navigating to the Applications Menu or by using the Keyboard shortcut “Ctrl + ALT + T” to open the terminal.

Step 2: Open Config File

To open the configuration file for GNOME Display Manager (GDM) in Ubuntu, use the command sudo nano /etc/gdm3/custom.conf. This command opens the file in the Nano text editor with administrative privileges, allowing you to make changes to the auto-login settings.

sudo nano /etc/gdm3/custom.conf 

Step 3: Comment the Auto Login Lines

In the opened /etc/gdm3/custom.conf file, locate the lines related to auto-login settings (usually under the [daemon] section) and comment them out by adding a # at the beginning of each line. This action disables the auto-login feature in Ubuntu’s GNOME Display Manager.

Step 4: Save and Exit the Editor

To save the changes made in the /etc/gdm3/custom.conf file using the Nano editor, press Ctrl + O to write the changes to the file, then press Enter. Next, press Ctrl + X to exit the editor. This ensures that the modified configuration file is saved and the editor is closed.

In Ubuntu, when the user logs in, the system can be configured to automatically log in without requiring a password. This feature is convenient for single-user systems or in situations where security is not a primary concern. However, there are cases where you may want to disable auto-login to enhance system security or enforce user authentication. In this article, we will explore two different methods to Disable Auto Login in Ubuntu.